The 5800U doesn't perform bad with AA/AF, but it does perform worse than other cards. That doesn't necessarily mean that the card is bad. Its certainly not worth going to a 5900 from a 5800U, you'll gain some and lose some, since in games like DoomIII the 5800U is actually faster.In any game where fillrate matters more than MBW, the 5800U is faster.
Fafnir: Intel Core 2 Quad firstname.lastname@example.orgGhz|eVGA 780i SLI|PNY GTX480 |Kingston DDR667 4096MB|WD Black Caviar 500GB|Seagate SATA 250GB|Seagate SATA 200GB| Seagate SATA 160GB|OptiArc AD-7173S DVDRW|Nec 3351 DVDRW|Creative X-FI XM|LG Flatron W2261V|Logitech X-530|Thermaltake Armor|Amptac 850W SLI PSU|Logitech G9 Mouse|Xigmatek HDT S-1283 CPU Cooler|Windows 7/FW 257.21
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